Filter for removable cartridges



Aug. 5, 1952 s. o. MORRISON ET AL FILTER FOR REMOVABLE CARTRIDGES Filed NOV. 25, 1947 2 SHEETSj-SHEET 1 Aug 5, 1952 s. o. MORRISON ET AL 2,605,901

FILTER FOR REMOVABLE CARTRIDGES Filed NOV. 25, 1947 2 SHEETS-SHEET 2 f2 FK 46 55 57 Jwemg aZ v arnueljwaam Y, intended for, filteringl water, filteringV other liquids.

Patented Aug. 5, 1952 ,STAT

ES ATLENIQFF l e, A 2,605,901"i *fff FILTER FORREMDVABLE CARTRIDGE 2,605,901 LCE;

Samuel 0. Morrison,Media, and John G. Weli'ri 'Y tion of Delaware f Application 'November 1 f te a filter particularly but suitable for 'Our invention relates A purpose of our invention removal and insertion of a removable filter cartridgefrom a'filtercase. i Y e further purpose isjto minimize-any deposit from ravvrwater or thelike onthe filter casing.

. -,A further purpose isv to cheapen the construco ytion of a filter cartridge and to'avoid the ynecesslty of providing connections as part of the cartridge. e

A further purpose is to seal to the side wall of a filter cartridge which has inlet at one end and outlet at the other end against a partition surrounding the cartridge from the filter casing,

' by a packing supported against the partition and tightened by a gland extension from an end closure of the casing.

A further purpose is to improve the sealing at a longitudinal seam vof the cartridge by providing ller metal inthe seam.

AH further purpose is to carry water or other liquid beingiil'tered through a port or ports in' the gland extension. Y Y

A further purpose is to support the cartridge resiliently at the end oppositerthe inlet to permit yielding of the same under abnormal pressurer surges. l

Av further purpose is to position a,V trap for filter material in the bottom below the outlet of vthe lfilter cartridge and to carry the outlet to the sides abovethe trap.

f and in the claims.

In the drawings We have chosen to illustrate a few only of thenumerous embodiments in which our invention appears, choosing the forms shown from standpoints of convenience in illustration,

satisfactory operation and clear demonstration `of the principles involved.

Figure 1 is a central longitudinal and preferably vertical section through a filter embodying -ablyvertical broken section of a variantform of our device.

Figure 4 is a section on the line 4-4 of Figure 3. Describing in illustration but not in limitation and referring to the drawings;

In lthe prior art, liquid alters of the type which is ,to simplify thev 25,1 f3 claims. (eifel-0 131) wein, Havertown, Pa., assignors toLSunroc Reh' Vfrigeration Company, D

over, Del.; a corporaarrestata naar er. vsuch as afwater cooler drinkingfountain have in some. casesv been Q prevideuiwitn removable cartridges, but .the een- L struction in` manyinstances has been so com-V plicated'tliat the expense of .producing the cartrid'gesior installing the same has frequently been excessive; j-Many'of the prior art cartridge constructions have required rather high tolerances to avoid leakage or short circuiting of liquids and these Vhave been difficult to maintain at reasonablev cost, especially as one of the mating surfaces y is normally subject to corrosion.

In our improved lter the` cartridge construcl tion itself is extremely simple and installation and'replacement is accomplished very easily.

The cartridge 20 is of cylindrical or tubular form, and consists of a sheet metal side wall 2| which is imperforate almost from end to end and suitably' joined together by a longitudinal lock seam 22. Since it is necessary to accomplish a seal against the` outer circumference, the cavity of the seam isV filled with. ller metal 23 (Figure 2) suchv 'as solder or Weld material, which is suitably smoothat the' outersurface 24, to follow the curvature of the periphery.

In drinking Water filter installations the cartridge `vvill preferably be mounted vertically as shown, although the device may be used in ltering for other purposes or filtering other liquids, in which casel mounting at some other angle may be desirable in a particular installation.

The lter cartridge is provided with an inlet 25 at one end, preferably the top, suitably through a screen 2B, and similarly has an outlet 21 near 'the opposite end, preferably the bottom, suit- Y ably through a `screen 28 andk radial ports 30. To

aid lateral flow beyond the inlet end, the side *walls at this point are preferably perforated at 29.

The content of the cartridge willv vary with 40'3 the material filtered, but in the particular embodiment shown, which is intended for ltering t without water softening, the filter'media omit rating screens as shown are interposed "between thelayers. Of course, other kmaterials may be included.v For ordinary purposes the walls of the i may b e employed for filtering drinkingwater. at Y n #cartridge -and the screens may be made of base metals, but it will be evident that where desired they or their effective outer surfaces may be of noble metal such as silver, for germicidal action.

The cartridge for purposes oftransport is provided preferably' at the bottom end with a bale or. handle, which may. desirably be a spring handle .35 which will permit carrying. i

As'shown inFigures 1 and 3, thel radial outlet ports v3i) from the cartridge are located Well above the closed bottom of the lter to providea hollow interior trap 21 whichl will catch and hold solid materiales'caping from the lter in case channeling Vor `the like causes Vportions of the lterto and Outletrboth' ofthe ing is locatedla p mi l theinterior ofjtherasinewall:and` supporting, preferably on its uppersideljazpacking 4j ofen--V pass through-the outlet screen The trap 21 assures that the escaping material will be caught f in the cartridge and removed-` therewith, and will not collect in the filter housing. Y

The cartridge is surroundedfin spaced relation.-

by a metallic casing 36 preferably of Ycylindrical bottoml closure B5 is drawn up to compress the packingbi' bya tighteningr screw 66 extending .through.agicenterjopening B'l in the bottom cloform, which is suii'icientlyflarger than the cartridge to be spaced therefrom at 31 to permit flow around the cartridge. c InletY to the casing.-

is provided preferably through a pipe 38 near the top, and outlet is provided preferably through Ya pipe 3.9 somewhat lowmeifclowri. Between the inlet cartridge'and of the cast'ridgev inside the cassiitably mounted: 011

ing and surround nular forni which, rests upon the partition at the sure' and threaded into the tightening bar at E8. The tightening screw is provided with an ex- ,teriorrhandle E9 and a packing nange l0 which compresses apacking 1|, preferably of rubber or synthetic rubber, around the hole 61.

The bottom springj is preferably slightly modified aty the v`center jas' shown to javoid contact withthe end of the tightenier screw and to permit the springto rest at least in parton the tighteningbar 63. j t

It will be evident that theinventionl possesses a number of distinct advantages. 'Raw Water or liquidto be ltered-islikely ,toy deposit slime,

casing at the 'outside throughout its circumfery rile parutionis atenasv cioseias possible to Y the inlet so thatoniy's Smau portion oftheY casing'at the top will beT exposed to theslimes and other deposits' in' raw'water; most'of the casing interior beingin contact only with filtered water 'The paekjinglalinay. beiffany suitame material, but it'vv'ill preferablyfbe of'r'easonably soft rubber or synthetic rubber Iso that itv can readily be compressed vt .'.engraglffirmlyV but 'resiliently' against the casingandthe cartridge.V

The upperend of ,the casing is threaded preferably on the interibrat 42 to v`receive' a threaded top closure' 43 and aiendga'sketdd preferably ofrubber orsyntlieticrubber, betweena flange 45v The bottom of thejcasllig isV closed by abottom closure is threadedto the outside of the casing c at 59 and compressing avpacking 5 I- preferably of rubber or syntheticrubberfagainst the end of the casinggj-V4 J Y The' cartridgev 1s esiliently supportedendwise and in fact: is Afloating011.spring :which en-AV gages the endclosurexfieirphe packing 4l is so resilient that oating .faction occurs lnotwithstanding the grip bythe packing;

ln the form ofFigures 3 ande, the closures Vare inodied but theldevicevis otherwisethe same. In this form tightening bar segments are provided in the interiorof the'casing near each end, suitably spaced' at 52".1for insertion and removalof the tightening bar. Atightening bar 53 at the top engagesY at 54 vunder the tightening bar segments .52 in"y closed position; `and makes threaded engagementrat 55`r preferably at the centerlwith a tightening screw 5S 'which extends throughanopening 51 in the topY closure 58 and has an exterior handle 59:7 VA' packing ilange 60 on the tightening screwicom'presses' a packing'l, preferably Nof rubber' or.vsynthetic rubber, around Ithe opening'iil. i Y.

The.'tightening bar -is carried radially through Y slots .321'.irrthe. gland; itheslotsextending longituf d-inallyffar enoughitofprovidejor vthe longitudinal take-p-inthe tightening bar with respect to the gland.

whichy isdifflcult to Vremove from the interior of the casing. All contactof the raw water with the casing is confined to the upper portion which -is readily accessible by removing the upper closure for cleaning. Aty the interior of Ythe casing around the space 131 vcontact is had only with nltered water orother liquid which is less likely to cause adeposit.l y l YDepending uponthe character of the installation, the cartridge may be inserted either from the bottomor the top as long as the top closure is loosened enough to take the pressure off the gasket M. vThus theoperator may insome cases remove both closures, or in other cases he may remove the top closure'only or may, loosen the top closure and remove the bottom closure only. The

cartridge can readily be grasped either from the top or the bottom at the rim adjoining the ports B or by the bale-35 at the bottom. Y

In many cases, in'water ysystems particularly, there are surges incident to turning on or shutting oi water or due to Water hammen'which are likelyto do seriousfdamage to the filter cartridge unless precautions are taken.` lty will be noted that the cartridge is supported by the spring 35 or 35 at the sidevaway from lorppposite to the inlet and that theonly other point of engagement or supportfis by` the resilientgasket which engages the side wall of the cartridge. Under abnormal conditions such `as pressure surges, the cartridge is free to'yield bothV against .the spring 35 or' 35' and alsobyY resilient yielding of the gasket `at its? inner ,preferably"overhangingV edge 'Il` .which extends inwardly substantially further than the inward extent of theparti'tionas shown.

Furthermore slippage of theA cartridge with respect'toi the Vpacking is permitted in extreme pressure sur'ges.'; V'lhis'desirable feature greatly 're'ducesthe danger of' damage to a cartridge of comparatively light construction.

As further protectionagainst Water'hammer, a surge tube 39" is -c'sonnectedconveniently tothe outlet Vby a Tv as shown and provides by its reverse bend and opposite closed end, an upstanding dead 'end portionwhich will vhold a column ofair and tend to absorb violent pressure surges in the system as well known in the art.VL

In operation, once Vthe casingisV installed, the

. easily.' if required; soon as4 the Cartridge has 1 been `repla'c'eda'nd the closuresV tightened, operation can be resumed by admitting water or other liquid to pass through the filter. The ow will be from the inlet 38 through the portsr48 and through the ports 29 at the upper rim of the cartridge, or around the end, then through the length of the cartridge and out the bottom through the ports 30 or around the bottom of the cartridge, up through the space 31 surrounding the cartridge and out the outlet 39.

It will be evident that the cartridge can be removed either from the top or the bottom of the casing at will.

In view of our invention and disclosure variations and modifications to meet individual whim or particular need will doubtless become evident to others skilled in the art, to obtain all or part of the benefits of our invention without copying the structure shown, and we, therefore, claim all such insofar as they fall within the reasonable spirit and scope of our claims.

Having thus described our claim as new and desire to secure by Letters Patent is:

1. In a filter, a vertical tubular casing, a pair of spaced tightening segments on the interior of the casing near the bottom, a tightening bar supported by the segments in closed position, a cap at the bottom of the casing, a tightening screw extending through the cap and making threaded connection with the tightening bar, packing between the bottom cap and the casing, packing ."f

between the tightening screw and the bottom cap, a iilter cartridge of tubular form resting on the tightening bar and extending vertically inside the casing in spaced relation, the cartridge having end inlet and outlet and tubular side walls capable 1.

of sealing between the inlet and the outlet, a partition on the casing extending inwardly at a point intermediate the ends of the cartridge and surrounding the same, walls forming an inlet to the interior of the casing at one side of the partition, Walls forming an outlet from the interior of the casing at the other side of the partition, a second pair of spaced tightening segments on the interior of the upper portion of the casing above the partition, a packing resting on the top of the partition and enga-ging the partition on the bottom, the casing on the outside and the cartridge on the inside, a second tightening bar extending across below the second tightening segments and secured thereon in closed position, a closure for the top of the casing, a second tightening screw extending through the closure and engaging the second tightening bar, packing between the top closure and the casing, packing between the second` tightening screw and the ton closure. and a packing gland on the top closure extending down and engaging and compressing the packing resting on the top of the partition, having openings invention what we through which the tightening bar at the top extends, the openings being larger than the tightening bar.

2. In a filter, a tubular cartridge having a generally straight cartridge housing provided with an inlet at one end and an outlet at the other end and having a loose nely divided lter medium inside the housing, a casing surrounding the cartridge and having a closure at the one end corresponding to the outlet of the cartridge, an inlet fitting connecting to the casing at the end corresponding to the inlet of the cartridge, an outlet fitting connecting tothe casing at a point spaced along the length of the cartridge from the inlet fitting, a partition extending radially inwardly from the inside of the casing at a position between the inlet and outlet fittings and terminating inwardly adjacent a portion of the outside' housing of the cartridge which is straight and cylindrical,

a resilient packing ring supported on the side of the partition toward the inlet of the cartridge, occupying the space between the interior of the casing and the exterior of the cartridge and engaging the exterior of the cartridge yieldably, the cartridge being free to yield resiliently longitudinally under pressure surges, a closure cap at the end of the casing adjoining the inlet fitting having a depending skirt provided with a port surrounding the end of the cartridge and engaging the end of the packing ring remote from the partition, and means for pressing the closure cap against the casing and pressing the skirt against the packing ring.

3. In a lter, a tubular cartridge having a generally straight cartridge housing provided with an inlet at one end and an outlet at the other end and having a loose nely divided lter medium inside the housing, a casing surrounding the cartridge and having a closure at one end corresponding to the outlet of the cartridge, an inlet fitting connecting to the casing at the end corresponding to the inlet of the cartridge, an outlet tting connecting to the casing at a point spaced along the length of the cartridge from the inlet fitting, a partition extending radially inwardly from the inside of the casing at a position between the inlet and outlet fittings and terminating inwardly adjacent a portion of the outside housing of the cartridge which is straight and cylindrical, a resilient packing ring supported on the side of the partition toward the inlet of the cartridge, occupying the space between the interior of the casing and the exterior of the cartridge and engaging the exterior oi the cartridge yieldably, the

cartridge being free to yield resiliently longitudithe cartridge and the closure at the end corresponding to the outlet of the casing, resiliently supporting the cartridge.

SAMUEL O. MORRISON. JOHN G. WEHRWEIN.

REFERENCES CITED The following references are or record in the iile of this patent:

UNITED STATES` PATENTS Number Name Date 316,925 Vogel Apr. 28, 1885 433,710 Aims, Jr Aug. 5, 1890 573,409 Hasenpflug Dec. 15, 1896 752,873 Sweeney Feb. 23, 1904 768,951 Rawson Aug. 30, 1904 857,736 Hodgson June 2 5, 1907 1,082,024 Held D60. 23, 1913 1,430,234 Keithline Sept. 26,1922 2,103,434 Pennebaker Dec. 28, 1937 2,295,097 Waugh Sept. 8, 1942 2,354,380 Kasten July 25, 1944 2,364,617 Bolser 1 Dec. 12, 1944 2,439,936 Kasten Apr. 20, 1948 FOREIGN PATENTS l Number Country Date Great Britain 1898 

